Ford does not want or recommed using synthetic or semi-syn fluids in this trans. just about everyone I know who use synthetic in Ford manual trans has had problems. stay wth regular old Mercon 2 for manuals. you are wasting time and $$$ putting synthetic in your manual trans. as it was told to me: "synthetic is too slippery tobe used in T-45's and TR-3650's"
you all can do what you like. Im not trying to sound like a ass but I make more money off your mistakes, I dont like to operate that way but...........